CHARMONIUM PRODUCTION IN Pb-Pb COLLISIONS WITH ALICE

被引：0

作者：

Saetre, Jon-Are ^{[1
]}

机构：

[1] Univ Bergen, Bergen, Norway

来源：

ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT | 2023年 / 16卷 / 01期

关键词：

DISSOCIATION; J/PSI;

D O I：

10.5506/APhysPolBSupp.16.1-A115

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Charmonium production is a direct probe of the quark-gluon plasma (QGP), a deconfined state of nuclear matter formed in heavy-ion collisions. For J/psi, a bound state of c (c) over bar quarks, its (re-)generation within the QGP or at the phase boundary, is found to be the dominant production mechanism at low transverse momentum (p(T)) and in central Pb-Pb collisions at the LHC energies. The relative production of the psi(2S) excited state with respect to the J/psi is one possible discriminator between the two different regeneration scenarios. In addition, the non-prompt component of J/psi production from b-hadron decays allows one to access the interaction of beauty quarks inside the QGP down to low p(T). In these proceedings, we present, for the first time, results on the psi(2S)-to-J/psi double ratio in Pb-Pb collisions at forward rapidity and root s(NN) = 5.02 TeV with respect to a new pp reference with an improved precision compared to the earlier publications. The combined Run 2 data set of ALICE allows the extraction of a signficant psi(2S) signal in central Pb-Pb collisions at forward rapidity down to zero transverse momentum. The psi(2S) nuclear modfication factor RAA as a function of p(T) and centrality will also be shown, as well as the inclusive J/psi R-AA at forward rapidity. At midrapidity, the inclusive, prompt and non-prompt J/psi R-AA as a function of centrality and p(T) will be presented, based on the full Run 2 statistics. The extraction of the non-prompt J/psi fraction extends other LHC measurements down to very low p(T) and its precision is improved signficantly compared to previous ALICE publications. Results will be compared with available theoretical model calculations.

引用

页数：6

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